產(chǎn)品詳情
（1） 目前國內(nèi)外防腐層應(yīng)用效果評價很好，對其使用中產(chǎn)生的缺陷報道的很少。報道的主要缺點有露點、剝離、陰極剝離、陰極保護(hù)屏蔽、剝離防腐層膜下腐蝕等，而且大部分有關(guān)缺陷的報道還停留在理論推測階段，如資料中提到陰極保護(hù)屏蔽的問題，到目前還沒有關(guān)于防腐層實際運作中出現(xiàn)陰極保護(hù)屏蔽的實例報道。經(jīng)過多年的實踐表明，隨著使用年限的增加，出現(xiàn)缺陷最少的涂層系統(tǒng)是FBE/擠壓聚乙烯3層結(jié)構(gòu)防腐系統(tǒng)。【勝倉管業(yè) 高經(jīng)理13730570531 QQ：2927372564】
（2） 通過對歐洲聚乙烯防腐層【勝倉管業(yè) 高經(jīng)理13730570531 QQ：2927372564】30年應(yīng)用史的回顧，雖然理論上剝離防腐層下會發(fā)生腐蝕或應(yīng)力腐蝕開裂，但目前還沒有發(fā)生剝離防腐層下出現(xiàn)膜下腐蝕或應(yīng)力開裂的案例。在德國曼內(nèi)斯曼研究所，曾經(jīng)進(jìn)行了長期的腐蝕實驗室實驗，以模擬防腐層應(yīng)用效果。腐蝕實驗環(huán)境有土壤、水、試驗主要檢查應(yīng)力腐蝕開裂問題，其實驗防腐是把有缺陷的聚乙烯防腐層鋼管置于腐蝕條件和應(yīng)力條件下，腐蝕環(huán)境為含有NaHCO3的沙土環(huán)境，溫度70℃，管地電位-430~-460mV，鋼管表面以不同方式預(yù)處理，【勝倉管業(yè) 高經(jīng)理13730570531 QQ：2927372564】所有鋼管均帶壓循環(huán)。實驗結(jié)束，防腐層缺陷周圍或多或少都有剝離，但剝離區(qū)為發(fā)現(xiàn)腐蝕。表面無氧氣化皮的鋼管為出現(xiàn)應(yīng)力開裂，有氧化皮的鋼管出現(xiàn)了開裂，裂紋最大深度0.2mm，可能是由應(yīng)力腐蝕造成。由此得出結(jié)論，徹底的表面處理是防止應(yīng)力開裂的有效手段。
（3） 陜京管道2003年開挖763m長管段，3PE防腐層共有破損點四個。由破損點的缺陷形式可以看出，防腐層的破損均是由硬物劃傷所致。對3PE直管和冷彎管3個探坑檢查，共檢測17出剝離強度，其中5處剝離強度值低于70N/ cm，最小剝離強度120N/cm,最大剝離強度200 N/cm。產(chǎn)生原因為陜京管道是國內(nèi)首次采用3PE涂敷技術(shù)，涂敷商的涂敷水平有限，對工藝工程的控制能立相對較差，可能導(dǎo)致個別管道的涂敷工藝設(shè)置不當(dāng)造成防腐層的粘接力差。防腐層剝離強度低只是個別部位，而且只要防腐層無破損，也不會造成管道腐蝕。【勝倉管業(yè) 高經(jīng)理13730570531 QQ：2927372564】
（4） 1999年和2003年對華北石油鋼管廠露天存放的陜京焊接彎頭管道剩余防腐管進(jìn)行了抽測，其防腐的性能基本沒有下降，尤其是華龍公司采用齊魯聚乙烯生產(chǎn)的防腐管，存放6年后各項指標(biāo)仍符合現(xiàn)行標(biāo)準(zhǔn)SY/T0413-2002規(guī)定，說明3PE防腐層確實具有優(yōu)良的耐久和抗衰老性能。
Sina News, the reporter (Yang Editor) was inbed: [Shengcangguan Senior Manager 13730570531 QQ: 2927372564] 3PE corrosion-resistant steel pipe perbance testing, draw the following conclusions:
(1) At present, the application effect of anticorrosive coatings at home and abroad is well buated, and there are few reports about the defects in the application.【勝倉管業(yè) 高經(jīng)理13730570531 QQ：2927372564】 The main shortcomings reported are dew point, stripping, cathodic stripping, cathodic protection shielding, stripping corrosion under the coating, etc. Most of the reports about the defects are still in the stage of theoretical speculation. For example, the problem of cathodic protection shielding is mentioned in the materials, so far no cathodic protection shield has been found in the actual operation of the coating. An example is reported. After years of practice, with the increase of service life, the coating system with the least defect is FBE / extruded polyethylene three-layer structure anticorrosion system.
(2) By reviewing the 30-year application history of European polyethylene anticorrosive coatings, although corrosion or stress corrosion cracking may occur in theory under peeling anticorrosive coatings, there are no cases of Subfilm corrosion or stress cracking under peeling anticorrosive coatings. A long-term corrosion laboratory experiment was carried out at the Mannesmann Institute in Germany to simulate the application effect of the coating. The corrosion test environment includes soil, water and test mainly to check the stress corrosion cracking problem. The experimental corrosion protection is to put the defective polyethylene coating steel pipe under the corrosion condition and stress condition. The corrosion environment is the sandy soil environment containing NaHCO3. The temperature is 70 C, the pipe ground potential is - 430 ~ - 460 mV. The surface of the steel pipe is pretreated in different ways. All steel pipes are packed under pressure. At the end of the experiment, the defects of the coating layer were more or less stripped around, but the stripping area was found to be corroded. The steel pipe with oxygen-free gasification skin app【勝倉管業(yè) 高經(jīng)理13730570531 QQ：2927372564】ears stress cracking, and the steel pipe with oxide skin appears cracking. The maximum depth of cracking is 0.2 mm, which may be caused by stress corrosion. It is concluded that thorough surface treatment is an effective way to prevent stress cracking.
(3) Shanxi Jing pipeline excavated 763m long pipe section in 2003, and there were four breakage points in 3PE anticorrosion layer. From the defect b, it can be seen that the breakage of the anticorrosive coating is caused by scratching hard bs. A total of 17 peeling strengths were tested in three pits of 3PE straight pipe and cold bend pipe. The peeling strengths were below 70N/cm in 5 places, the minimum peeling strength was 120N/cm, and the maximum peeling strength was 200 N/cm. The reason is that the 3PE coating technology is first used in Shaanxi-Beijing pipeline in China. The coating level of the coater is limited and the control ability of the process engineering is relativ【勝倉管業(yè) 高經(jīng)理13730570531 QQ：2927372564】ely poor, which may lead to poor adhesion of the anticorrosive coating caused by improper coating technology for individual pipelines. Low peeling strength of anticorrosive coating is only a few parts, and as long as the anticorrosive coating is not damaged, it will not cause pipeline corrosion.【勝倉管業(yè) 高經(jīng)理13730570531 QQ：2927372564】
(4) Residual anticorrosion pipes of Shaanxi-Beijing welded elbow pipes stored in North China Petroleum Pipe Works in 1999 and 2003 were sampled and tested. The anticorrosion perbance of the remaining anticorrosion pipes basically did not decrease. Especially, the anticorrosion pipes produced by Hualong Company using Qilu polyethylene still meet the current standard SY/T0413-2002 after 6 years of storage. The E anticorrosion coating has excellent durability and anti-aging properties.
